Alter Table Conflict

Question

ALTER TABLE EA.TECHNOLOGY_UTILIZATION
ADD CONSTRAINT  TECHUTIL_FK_IT_1 
FOREIGN KEY (INFORMATION_TECHNOLOGY_ID) 
REFERENCES EA.INFORMATION_TECHNOLOGY(INFORMATION_TECHNOLOGY_ID)

go

when I execute this command I get this error

Msg 547, Level 16, State 0, Line 1
The ALTER TABLE statement conflicted 
with the FOREIGN KEY constraint "TECHUTIL_FK_IT". 
The conflict occurred in database 
"test_db", table "EA.INFORMATION_TECHNOLOGY", 
column 'INFORMATION_TECHNOLOGY_ID'.

I thought there is some dependency or exisitng already.. for safe side.. dropped the constraint.. then the error message said

Msg 3728, Level 16, State 1, Line 1
'TECHUTIL_FK_IT' is not a constraint.
Msg 3727, Level 16, State 0, Line 1
Could not drop constraint. See previous errors.

Any insight.. of the issue here?

Answer 1

0

I think the problem is that there are values in the TECHNOLOGY_UTILIZATIONADD column of INFORMATION_TECHNOLOGY_ID that aren't present in INFORMATION_TECHNOLOGY. Try this query to test:

select  *
from    EA.TECHNOLOGY_UTILIZATIONADD tu
    left join EA.INFORMATION_TECHNOLOGY it on it.INFORMATION_TECHNOLOGY_ID = tu.INFORMATION_TECHNOLOGY_ID
where   it.INFORMATION_TECHNOLOGY_ID is null

That will show you the offending rows. You'll have to fix them before you can add the constraint.

answered Mar 26 '10 at 03:34 PM

David Wimbush
4.2k ● 25 ● 29 ● 31

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Alter Table Conflict

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